Re: Domainkeys and ISPs
> On Sat, Mar 15, 2008 at 10:16:32AM +0800, Thomas Goirand wrote:
> > Lionel Elie Mamane wrote:
>
> >>> Isn't DKIM supposed to be an auth for the From: field?
>
> >> Well, then transpose my whole argument to the From: field. It
> >> doesn't make much of a difference.
>
> > Of course it does!
>
> > If somebody is sending with a From: with a domain installed on my
> > server, then it's going to be either sent from localhost, or using
> > smtp with auth.
On 17.03.08 11:54, Lionel Elie Mamane wrote:
> I don't see why this implication would hold. A domain "installed on
> your server" is a domain for which you are MX; that means that mail
> *to* that domain goes to your server, not that mail *from* that domain
> originates from your server. For a concrete example, I host the
> conuropsis.org domain, and various users have various email addresses
> in that domain. If they send email to your users, using their
> @conuropsis.org address in the "From:" header, why would my server be
> involved? They don't need to SMTP-auth send it to me, they can send it
> directly to *your* machine, or their ISP's smarthost (which will send
> it to your machine).
>
> Now, if one of my users send email to another @conuropsis.org address,
> and they use their ISP's smarthost to send all their mail, obviously
> this ISP's outgoing SMTP server will not have an SMTP-auth
> relationship with my MX; in this case, I do get an email with a domain
> "installed on my server" in the "From:" field, that comes in from a
> foreign IP address (not localhost), and not with SMTP-auth.
But how is your mail related to DKIM?
If you stasrt using DKIM on one of those domains, users will have either to
sign the mail themselves, or use yoru mailserver to let it do the signing.
In such case, you server will have to know when to sign the e-mail and when
not...
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